<template>
	<view>
		<my-search></my-search>
		<view class="scroll-view-container">
			<!-- 左侧的滚动视图区域 -->
			<scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
				<view @click="changIndex(index)" v-for="(item,index) in cateLIst" :key="item.cat_id"
					class="left-scroll-view-item " :class="{active:active===index}">
					{{item.cat_name}}
				</view>
			</scroll-view>
			<!-- 右侧的滚动视图区域 -->
			<scroll-view :scroll-top="top" class="right-scroll-view" scroll-y :style="{height: wh + 'px'}">
				<view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
					<!-- 动态渲染三级分类的列表数据 -->
					<view class="cate-lv3-list">
						<!-- 三级分类 Item 项 -->
						<view class="cate-lv3-item" @click="gotoCart(item3)" v-for="(item3, i3) in item2.children"
							:key="i3">
							<!-- 图片 -->
							<image :src="item3.cat_icon"></image>
							<!-- 文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				wh: 0,
				cateLIst: [], //一级
				cateLevel2: [], //二级
				active: 0,
				top: 0
			};
		},
		created() {
			const res = uni.getSystemInfoSync()
			this.wh = res.windowHeight
			this.getcateLIst()
		},
		methods: {
			async getcateLIst() {
				const res = await uni.$http.get('/api/public/v1/categories')
				this.cateLIst = res.data.message
				this.cateLevel2 = this.cateLIst[0].children
			},
			changIndex(index) {
				this.active = index
				this.cateLevel2 = this.cateLIst[index].children
				//scroll-top的前后的值不能一样
				this.top = this.top === 0 ? 1 : 0
			},
			gotoCart(item) {
				uni.navigateTo({
					url: `/subpkg/goods_list/goods_list?cid=${item.cat_id}`
				})
			}

		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;

		.left-scroll-view {
			width: 120px;

			.left-scroll-view-item {
				line-height: 60px;
				background-color: #f7f7f7;
				text-align: center;
				font-size: 12px;

				// 激活项的样式
				&.active {
					background-color: #ffffff;
					position: relative;

					// 渲染激活项左侧的红色指示边线
					&::before {
						content: ' ';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #c00000;
						position: absolute;
						left: 0;
						top: 50%;
						transform: translateY(-50%);
					}
				}
			}
		}
	}

	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}

	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;

		.cate-lv3-item {
			width: 33.33%;
			margin-bottom: 10px;
			display: flex;
			flex-direction: column;
			align-items: center;

			image {
				width: 60px;
				height: 60px;
			}

			text {
				font-size: 12px;
			}
		}
	}
</style>